KR100569872B1 - Tread compound for tire including agent enhanced carbon black performance - Google Patents

Abstract

The present invention relates to a tread rubber composition for a tire. More specifically, in a tread rubber composition for a tire to which carbon black is applied as a reinforcing filler, a tread rubber composition for a tire can be improved by including a carbon black performance enhancer. It is about.

The present invention can improve the abrasion resistance, tensile properties, braking force on wet road surface, and rolling resistance by applying a carbon black performance enhancer to a rubber compound to which carbon black is applied as a reinforcing filler in consideration of the relationship between silica and silane coupling agent. An object is to provide a tread rubber composition for a tire. In another aspect, the present invention is to provide a tire comprising a tread made of the tread rubber composition for the tire.

The tread rubber composition for tires of the present invention comprises 40 to 90 parts by weight of carbon black and 2 to 8% of carbon black content enhancing agent based on 100 parts by weight of the raw material rubber in a known tread rubber composition for tires. .

Description

Tread compound for tire including agent enhanced carbon black performance}

The present invention relates to a tread rubber composition for a tire. More specifically, in a tread rubber composition for a tire to which carbon black is applied as a reinforcing filler, a tread rubber composition for a tire can be improved by including a carbon black performance enhancer. It is about.

BACKGROUND ART In recent years, in rubbers used in tires, rubber compositions having excellent braking force and wet rolling resistance on wet roads as reinforcing fillers are used in combination with carbon black or silica alone. However, since silica has a strong hydrophilic group, the cohesiveness is high due to the interaction between silicas, and thus the dispersibility is low, and when used in a rubber composition, the viscosity may increase due to poor dispersion and gel property may be degraded due to gelation reaction for a long time. In order to solve the problem of silica, dispersing aids, process oils and coupling agents are used to improve the dispersibility of the silica. However, in spite of this treatment, the dispersibility of silica is low, which causes irregular wear phenomenon in the finished tire made of a rubber composition to which silica is applied.

On the other hand, when carbon black is used as a reinforcing filler in rubber compositions, the wear resistance of rubber is improved, but there is a problem in that braking force and rotational resistance characteristics on wet roads are lower than those of silica.

Generally, a silane coupling agent is applied to a rubber compound to apply silica to improve silica dispersibility, but a separate process aid is used to improve the dispersibility of carbon black and rubber to a rubber compound to which carbon black is applied. It is not.

The present invention can improve the abrasion resistance, tensile properties, braking force on wet road surface, and rolling resistance by applying a carbon black performance enhancer to a rubber compound to which carbon black is applied as a reinforcing filler in consideration of the relationship between silica and silane coupling agent. An object is to provide a tread rubber composition for a tire.

In another aspect, the present invention is to provide a tire comprising a tread made of the tread rubber composition for the tire.

In order to achieve the above-mentioned object of the invention, the tire tread rubber composition of the present invention is a known tire tread rubber composition, 40 to 90 parts by weight of carbon black, carbon black performance enhancing agent with respect to 100 parts by weight of the raw material rubber It contains 2 to 8% relative to the carbon black content.

In the present invention, the raw material rubber can be used as long as it can be used as the raw material rubber of the conventional tire tread rubber composition. As an example of such raw rubber, in the present invention, synthetic rubber such as natural rubber, styrene butadiene rubber, butadiene rubber, styrene butadiene rubber containing isoprene, styrene butadiene rubber containing nitrile, and neoprene rubber may be used alone or two or more of them. Mixed rubber mixed with synthetic rubber can be used. In addition, it is possible to use a mixture of the natural rubber and synthetic rubber mixed in a ratio of 1: 9 to 9: 1. On the other hand, when the raw material rubber is composed of a mixture of two kinds of synthetic rubber, the two types of synthetic rubber can be used as the raw material rubber mixed rubber in a ratio of 1: 9 to 9: 1, respectively.

If less than 40 parts by weight of carbon black with respect to 100 parts by weight in the present invention there is a problem that the physical properties of the rubber is lowered, when used over 90 parts by weight there is no obvious increase in physical properties of the rubber is not preferable in terms of cost. Therefore, the carbon black used as the reinforcing filler in the present invention is preferably applied to 40 to 90 parts by weight of carbon black.

In the rubber composition of the present invention, the carbon black performance enhancer may add 2 to 8% of the carbon black content to the rubber composition to maximize the performance of the carbon black. In the present invention, when the carbon black performance enhancer is used less than 2% of the carbon black content, it is insignificant to maximize the performance of the carbon black, and when it is used more than 8% of the carbon black content, the effect is obvious in showing the maximum performance of the carbon black. There is no rise. Therefore, the carbon black performance enhancer in the present invention is preferably added 2 to 8% compared to the carbon black content.

Carbon black performance enhancer in the present invention can be used as long as it can be applied to the rubber composition to maximize the performance of the carbon black to improve the physical properties of the rubber. In the present invention, as an example of the carbon black performance enhancer, dibutyl xanthogen disulfide containing disulfide in the main chain may be used.

In the present invention, when dibutyl xanthogen disulfide is applied to a rubber compound as a performance enhancer of carbon black, the compound is blended at a high temperature of 170 ° C. or higher to increase the reactivity to improve the high temperature stability during the compounding. In addition, by increasing the bound rubber content, which is a measure of the reactivity between carbon black and rubber, it can increase the tensile properties and rebound performance of the rubber and at the same time lower the heat generation, and improve the wear resistance, braking force on the wet road surface, and rolling resistance.

According to the present invention, various additives such as activators, anti-aging agents, process oils, vulcanizing agents, and vulcanization accelerators used in conventional tire tread rubber compositions, in addition to the above-mentioned raw rubbers, carbon black, and carbon black performance enhancing agents may be appropriately selected. It can be used in a predetermined content. However, these are general components used in conventional tire tread rubber compositions, and thus are not essential components of the present invention, and thus the detailed descriptions thereof will be omitted.

Meanwhile, the present invention includes a tire having a tread made of the tire tread rubber composition. In this case, the tire includes any one selected from tires for automobiles, tires for trucks, and tires for buses.

Hereinafter, the present invention will be described by the following comparative examples, examples and test examples. However, these are not limited to the scope of the present invention by these as an embodiment of the present invention.

Comparative Example

72 parts by weight of carbon black (N330), 2.5 parts by weight of zinc, 2.5 parts by weight of stearic acid, and an anti-aging agent based on 100 parts by weight of a raw material rubber composed of 75 parts by weight of solution-polymerized styrene butadiene rubber (SBR) and 25 parts by weight of butadiene rubber (BR). Kumanox-RD, Kumho Petrochemical) 2.0 parts by weight were placed in a Banbury mixer and reacted at 170 ° C. for 30 minutes to obtain a primary blend. In the primary formulation, 2.0 parts by weight of sulfur and 1.5 parts by weight of vulcanization accelerator (N-cyclohexyl-2-benzothiazolsulfen amide, CZ) were placed in a Banbury mixer and vulcanized at 100 ° C. for 20 minutes to prepare a rubber.

<Example>

Rubber using the same composition and method as the comparative example except for adding 3.0% (2.16 parts by weight) of dibutyl xanthogen disulfide (DXD) having disulfide in the main chain as a carbon black performance enhancer Was prepared.

Table 1. Composition of Comparative Example and Example (unit: parts by weight)

Item Comparative example Example Styrene Butadiene Rubber 75 75 Butadiene rubber 25 25 Carbon black 72 72 Zincification 2.5 2.5 Stearic acid 1.0 1.0 Anti-aging 2.0 2.0 Process oil 4.0 4.0 Dibutyl Jansogen Disulfide - 2.16 brimstone 2.0 2.0 Vulcanization accelerator 1.5 1.5

<Test Example>

Viscosity, scorch time, vulcanization time, hardness, 300% modulus, tensile strength, elongation, heat generation, rebound, glass transition temperature (Tg), and dynamic viscoelasticity (Tanδ (0 ° C.)) for the rubbers of the comparative examples and examples. , Tanδ (70 ° C.), Dean wear, and bound rubber content were measured by ASTM-related regulations and the results are shown in Table 2 below.

Table 2. Physical Properties of Comparative Examples and Examples

Item Comparative example Example Viscosity (100 ° C) 68 70 Scorch time (t5) 15.3 12.7 Rush time (t90) 11.5 10.5 Shore A 65 64 300% modulus (kgf / cm ² ) 129 183 Tensile strength (kgf / cm ² ) 189 203 % Elongation 420 350 Fever (temperature difference) 25 18 Rebound (1st) 35.4 42.8 Tanδ (0 ° C) * 0.371 0.439 Tanδ (70 ° C) * 0.273 0.206 Dinmamo (Index) 100 116 Bound rubber content (%) ** 43 76

* Dynamic viscoelasticity (Tan δ): Measured by changing the temperature at 11Hz, 1.25% strain condition using the Leohebron test (Rheovibron test) and the value is shown. The larger the value of Tanδ (0 ° C), the better the braking performance on wet road surfaces. In addition, the smaller the value of Tanδ (70 ℃) shows a lower rotational resistance, which means that the rotational resistance characteristics are excellent.

** Indicates a measure of reactivity between carbon black and rubber.

As shown in Table 2, which is the result of the test example, it can be seen that the example rubber prepared by the rubber composition of the present invention has improved tensile properties such as 300% modulus and tensile strength compared to the rubber of the comparative example prepared by the conventional rubber composition. In addition, heat generation and rebound characteristics are improved, and even in the dynamic viscoelastic properties, the value of Tanδ (0 ° C.) is high, so the braking force is excellent on wet roads, and the value of Tanδ (70 ° C.) is low, low rolling resistance, It can be seen that it is significantly improved.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

Claims (3)

In the tread rubber composition for tires, A tire comprising 40 to 90 parts by weight of carbon black based on 100 parts by weight of raw material rubber, and 2 to 8% of dibutyl xanthogen disulfide containing disulfide in the main chain as a performance enhancing agent of carbon black. Tread rubber composition. delete A tire comprising a tread made of the tread rubber composition for tires according to claim 1.